xmms is (imho) the best music player that ships with FC simply from a
usability standpoint, small screen footprint etc.
However, it does not use the gtk2 interface and does not use the
gstreamer backend.
I found what I think would be a good replacement - it currently does
not work for me, so it has that against it, but that may be because I
updated my gstreamer plugins from stock fc3 (to 0.8.6) though that
hasn't effected other gstreamer apps.
It's called eina -
http://bolgo.cent.uji.es/proyectos/eina-en
It has a very small screen footprint, and simple easy to use interface.
It works for me up to the point of actually playing a song, then it
hangs (I've only tried mp3 - I haven't tried flac or ogg). But I think
it is worth looking into for possible inclusion in Fedora Extras and
eventual replacement of xmms, which doesn't seem interested in gtk2 or
gstreamer support.